package org.coffeebreaks.james.mailets.directory;

/**
 * Copyright 2008 Jerome Lacoste.
 *
 * Licensed under the Apache License, Version 2.0 (the "License" );
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Directory functions.
 * @author jerome@coffeebreaks.org
 */
public interface DirectoryService {
  /**
   * Return the known emails of the members of the specified group.
   * The directory makes no guarantee to return a list without duplicates.
   * @param groupname the group name
   * @return null if the group doesn't exist, an empty array if there are no members or no known emails 
   */
  String[] getGroupEmails(String groupname);

  /**
   * Return the known email of the specified user, if any.
   * @param username the user name 
   * @return null if the user doesn't exist or has no email
   */
  String getUserEmail(String username);
}
